High sensitivity cascaded preamplifier with an optical bridge structure in Brillouin distributed fiber sensing system

Weihong Bi; Hang Lin; Xinghu Fu; Guangwei Fu

doi:10.1117/12.2033501

20 December 2013 High sensitivity cascaded preamplifier with an optical bridge structure in Brillouin distributed fiber sensing system

Weihong Bi, Hang Lin, Xinghu Fu, Guangwei Fu

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Proceedings Volume 9044, 2013 International Conference on Optical Instruments and Technology: Optical Sensors and Applications; 904404 (2013) https://doi.org/10.1117/12.2033501
Event: International Conference on Optical Instruments and Technology (OIT2013), 2013, Beijing, China

Abstract

Fiber amplifiers such as Erbium-doped fiber amplifier (EDFA) played a key role in developing long-haul transmission system and have been an important element for enabling the development of optical communication system. EDFA amplifies the optical signal directly, without the optical-electric-optical switch and has the advantages such as high gain, broad band, low noise figure. It is widely used in repeaterless submarine system, smart grid and community antenna television system. This article describe the application of optical-fiber amplifiers in distributed optical fiber sensing system, focusing on erbium-doped fiber preamplifiers in modern transmission optical systems. To enhance the measurement range of a spontaneous Brillouin intensity based distributed fiber optical sensor and improve the receiver sensitivity, a two cascaded EDFAs C-band preamplifier with an optical bridge structure is proposed in this paper. The first cascaded EDFA is consisted of a length of 4.3m erbium-doped fiber and pumped in a forward pump light using a laser operating at 975nm. The second one made by using a length of 16m erbium-doped fiber is pumped in a forward pump light which is the remnant pump light of the first cascaded EDFA. At the preamplifier output, DWDM, centered at the signal wavelength, is used to suppress unwanted amplified spontaneous emission. The experimental results show that the two cascade preamplifier with a bridge structure can be used to amplify for input Brillouin backscattering light greater than about -43dBm. The optical gain is characterized and more than 26dB is obtained at 1549.50nm with 300mW pump power.

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Weihong Bi, Hang Lin, Xinghu Fu, and Guangwei Fu "High sensitivity cascaded preamplifier with an optical bridge structure in Brillouin distributed fiber sensing system", Proc. SPIE 9044, 2013 International Conference on Optical Instruments and Technology: Optical Sensors and Applications, 904404 (20 December 2013); https://doi.org/10.1117/12.2033501

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KEYWORDS

Optical amplifiers

Sensing systems

Bridges

Fiber optics sensors

Fiber amplifiers

Signal detection

Backscatter

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